Update Spectrum questline again

[Gronglegrowth]

I was dissatisfied with my previous work, and so made a second attempt, which reorganizes the layout of things, fixes my earlier mistakes regarding hidden quests, adds yet more quests describing other things I thought were useful, and offers additional guidance.

I am not too sure on the layout I have gone with, that is welcome to be changed if others can do better. Attached here is a screenshot of the chapter: